@ARTICLE{8719905,
  author={Cao, Hui and Huang, Long-Ting and Wu, Yuntao and Liu, Qi},
  journal={IEEE Access}, 
  title={Multidimensional Single-Tone Frequency Estimation Based on QR Decomposition}, 
  year={2019},
  volume={7},
  number={},
  pages={68153-68159},
  doi={10.1109/ACCESS.2019.2918152}}